I'm a big fan of Darren Rowse but his latest post on How to Get Search Engine Traffic to Your Blog missed the boat.  My issue with his post is that there's no conversation about why a person would blog for search optimization. Darren went on to comment about the traffic sources (with a very good graphic with the break-down) but again, he did not differentiate the why.

You should not be initiating a strategy of how without first asking why.

The majority of search engine traffic to your blog is coming there to seek information that you've provided relevant results for in the search engines.  In other words, these are primarily people that may not recognize your brand, your products or services, but they happened upon you because you wrote content that indexed well.

That may require you to write your content very differently than how you would go about writing content to keep existing readers.  Problogger states:
Search Engine Optimization, participating in social media, building community and producing content are four important elements of building a site that gets (and keeps) high levels of traffic. When a blogger becomes obsessed by any one of them (to the detriment of others) the site can suffer (or at least not realize its potential). When the four elements come together a blog can grow quite rapidly.
The conversation you have with existing readers can be very different with social networking tools and other mediums such as email, but let's be honest... blogging for SEO is an acquisition strategy more than a retention strategy for business blogging.  You should adapt accordingly and review your analytics to ensure your messaging and goals are properly set.

Once you transition from acquisition to retention, you can put to full use your other tools - email, micro-blogging, social media messaging, etc.  So, to answer How to Get Search Engine Traffic to Your Blog, Brian's response should have been to:

Problogger Balance in SEO TrafficWrite relevant content that search engine users are looking for that will drive business results to your company and increase your search engine traffic.  When they get to your site, transition their attention into the benefits of using your products or services and provide them with a conversion opportunity to engage further (newsletter opt-in, demo sign-up, contact a salesperson, etc.).

Manage the ongoing relationship accordingly but leverage the benefits of blogging for what they are best suited... getting people to you from Search Engines.  I do not believe you should be balanced in your blog - but in your overall communication strategy.